What we found is that Dragonborn may save Arivanya in the marketplace of Windhelm by killing the butcher before he stabs her.
Arivanya is an Altmer resident of Windhelm and wife of Ulundil. She is one of the possible women to be murdered by The Butcher at the end of "Blood on the Ice".
Check out full game walkthrough for all 75 Achievements in The Elder Scrolls V: Skyrim Special Edition at Trueachievements.com.